Sterling Silver and 14k Yellow Gold Diamond and Oval Swiss Blue Topaz Heart Knot Pendant Necklace (0.005 cttw, I-J Color, I3 Clarity), 18" The natural properties and composition of mined gemstones define the unique beauty of each piece. The image may show slight differences to the actual stone in color and texture All our diamond suppliers confirm that they comply with the Kimberley Process to ensure that their diamonds are conflict free.